So what does their favourite book reveal about the Duchess of Cambridge and the Prime Minister?

Kate Middleton and David Cameron revealed their favourite reads to Oasis Academy students, who wrote to them as part of World Book Day.

In a letter this week to Year 7 student Elle Gurney, of Addington, Kate Middleton divulged that her favourite book was Anne of Green Gables, the 1908 bestselling novel about an orphan growing up in Canada.

Related content

And Mr Cameron told Barbara Silva, 11, from Purley, that he favoured Our Island Story, by Henrietta Elizabeth Marshall, a bestselling history of Britain from Roman to Victorian times.

The students asked a handful other famous folk for their favourite reads. The Queen and Jamie Oliver replied but kept their choices secret. Peter Andre, Katie Price, Sir Alex Ferguson, Harry Hill and others have yet to respond.

Oasis Academy teacher John Cook said: "The students were so excited to receive their letters and it's amazing that such important and busy people have taken the time to reply; we do hope we get more."

The academy plans to display the letters and create a "world book wall of fame".